Editor launch error post crash: libUE4Editor-UnrealEd.so: undefined symbol: _ZN11FDDCCleanup8RunnableE

After compiling from source and troubleshooting an issue regarding the CLionSourceCodeAccessor developer plugin and my /opt/ directory; I finally (and successfully) navigated the sub-menu to create a C++ class. The progress bar corresponding to the creation and compiling of the class, progressed to 79% and never progressed any further. Additionally, the UI and terminal were unresponsive; resulting in the process having to be killed.

Now, with every attempt to launch the editor via the command “./UE4Editor” within the directory of the Linux binaries—the following error is thrown: “/Engine/Binaries/Linux/libUE4Editor-UnrealEd.so: undefined symbol: _ZN11FDDCCleanup8RunnableE”

Additionally, I would like to note that the 2 previous projects that were created as a test environment for the setup process were intentionally deleted after the crash as well. Thank you in advance.


I don’t know what are the steps you have taken. These type of errors actually means your engine source is at an inconsistent state. This is the reason why you cannot start any project/editor.
Best way to resolve these type of issue is to re-compile your Unreal Engine from scratch . It will take sometime, but you will be fine after the re-compilation.